RENAULT MEGANE WARNING LIGHT PROBLEM

2000 Renault Megane • 83,000 miles

Hi I've got a Renault megane 2.0 coupe sport ide it runs fine cold but when engine warm the warning light which I believe is the electronic warning light comes on and won't go above 3000 revs the light is like a zig zag line and like a loop to loop light underneath just latley they car has been cutting out when the light flickers on and off and when I'm driving along the car jolts back just before light comes on it's also slow starting any help would be great as my wife is 7months pregnant and I need the car many thanks Paul